Chi Cassiopeiae

Chi Cassiopeiae

Map of the Bayer-designated stars in Cassiopeia. Chi Cassiopeiae is circled.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cassiopeia
Right ascension 01h 25m 56.02238s[1]
Declination +68° 07′ 48.0460″[1]
Apparent magnitude (V) +4.696[2]
Characteristics
Spectral type G9 IIIb[3]
U−B color index +0.762[2]
B−V color index +0.997[2]
Astrometry
Radial velocity (Rv)+6.66±0.14[4] km/s
Proper motion (μ) RA: −43.03±0.34[1] mas/yr
Dec.: −22.31±0.32[1] mas/yr
Parallax (π)15.67 ± 0.39 mas[1]
Distance208 ± 5 ly
(64 ± 2 pc)
Absolute magnitude (MV)+0.52[5]
Details[5]
Mass2.04 M☉
Radius11.0±0.8[3] R☉
Luminosity67.6 L☉
Surface gravity (log g)2.21 cgs
Temperature4,746 K
Metallicity [Fe/H]−0.34 dex
Rotational velocity (v sin i)0.44±0.45[6] km/s
Age1.0 Gyr
Other designations
χ Cas, 39 Cas, BD+58° 260, HD 9408, HIP 7294, HR 442, SAO 22397[7]
Database references
SIMBADdata
χ Cassiopeiae in optical light

Chi Cassiopeiae (χ Cassiopeiae) is a solitary,[8] yellow-hued star in the constellation Cassiopeia. It is visible to the naked eye with an apparent visual magnitude of +4.7.[2] Based upon an annual parallax shift of 15.67 mas as seen from Earth,[1] this system is located roughly 208 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.18 due to interstellar dust.[4]

With a stellar classification of G9 IIIb,[3] it has the spectrum of an evolved, G-type giant star. It has an estimated age of a billion years[5] and is a red clump star that it is generating energy through helium fusion at its core.[9] The star has about double[5] the mass of the Sun and has expanded to 11[3] times the Sun's radius. It is radiating 67.6 times the Sun's luminosity from its photosphere at an effective temperature of 4,746 K.[5]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Jennens1975 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Nordgren1999 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference Takeda2008 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Jofre2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Valentini2010 was invoked but never defined (see the help page).